i think spike is right. i mean, we live in 2007, every normal computer can manage a whole village made up with houses up to 2000 polys. most, it depends on the texture resolution and size. and if the computer has to render a lot of models which are actually the same, he renders them just as one. i don't think that 2000+ should be a problem. a few bumpmaps here, some normalmapping there and everythings just fine.